David, When there is a specification for the value returned as the result of a request for signal strength I will be glad to fix this. It returns zero because the API does not give enough guidance as to what the returned value means. Is it a) Actual signal strength in dB as a signed integer b) Actual signal strength in tenth's of dB as a signed integer c) Percent (of what) with values 0 to 100 d) 0 to 100 percent (of what) with values 0 to 0x7FFF e) 0 to 100 percent (of what) with values 0 to 0xFFFF f) Tenth's of a percent of c, d, or e g) Something completely different like the raw AGC value from the tuner The chip does not return signal strength directly. I can make up a number based on signal to noise ratio (SNR) which is returned by the chip. I don't have the test equipment required to accurately calibrate signal strength. I can make it return a number in tenths of dB similar to the Windows driver for the DViCO cards. The other important number for determining signal quality is the bit error rate (BER) which is also returned by the chip. I tried returning the actual SNR in DB when I wrote the driver. This is a signed number. It is negative for bad signals and a small positive number less than 100 for good signals. I got complaints that it was wrong since the returned value is unsigned and the poor SNR negative values looked like large numbers while the good SNR values were small numbers. The result is raw data for values read from the chip and 0 for values that can not be read from the chip directly. --Mac On Thursday 16 March 2006 03:14 pm, C. David Cooke wrote: > Hey, > > > > I saw in the sources for lgdt330x.c that the signal > strength always returns 0 and that adding support for the > signal strength is on the TODO list. Can anyone give me > a status on this? What would it take to get this > working? How can I help? > > > > I have one of these cards and am having problems with > video stuttering and I'm trying to track down the problem > - having a signal strength would really help . > > > > Thanks - > > > > David _______________________________________________ linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
